package com.aurora.base.util;

import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Hashtable;
 
import javax.imageio.ImageIO;
 
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
 
public class QrCodeUtil {
     
    private static final int BLACK = 0xFF000000;
    private static final int WHITE = 0xFFFFFFFF;
    
    
    
     
    /**
     * 根据content生成二维码直接写到response的输出流
     * @param content 内容
     * @param output
     * @throws WriterException
     * @throws IOException
     */
    public static void genGR(String content, OutputStream output) throws WriterException, IOException {
        int width = 300;
        int height = 300;
        String format = "jpg";
        Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        BitMatrix bm = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints);
         
        BufferedImage image = toImage(bm);
        ImageIO.write(image, format, output);   //把二维码写到response的输出流
    }
 
    private static BufferedImage toImage(BitMatrix bm) {
        int width = bm.getWidth();
        int height = bm.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        for(int x = 0;x < width; x++){
            for(int y = 0; y < height; y++ ){
                image.setRGB(x, y, bm.get(x, y) ? BLACK : WHITE);
            }
        }
        return image;
    }
 
}
